/* ═══════════════════════════════════════════════
   KOREAN ACADEMY v2 — Premium Dark Gold Theme
   Inspired by Kangbo Academy Design System
   ═══════════════════════════════════════════════ */

:root {
  --gold: #E2B64F;
  --gold-dark: #C49A35;
  --gold-light: #F5D98E;
  --gold-glow: rgba(226, 182, 79, 0.15);
  
  --bg-deep: #050508;
  --bg: #09090B;
  --bg-elevated: #131316;
  --bg-card: #18181B;
  --bg-card-hover: #1C1C20;
  --bg-input: #1A1A1E;
  
  --text: #FAFAFA;
  --text-secondary: #A1A1AA;
  --text-tertiary: #71717A;
  --text-dim: #52525B;
  
  --border: #27272A;
  --border-light: #3F3F46;
  --border-gold: rgba(226, 182, 79, 0.3);
  
  --success: #22C55E;
  --success-bg: rgba(34, 197, 94, 0.1);
  --danger: #EF4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --warning: #F59E0B;
  --info: #3B82F6;
  
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.6);
  --shadow-gold: 0 0 30px rgba(226, 182, 79, 0.1);
  
  --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Inter", system-ui, sans-serif;
  --font-korean: "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ═══════════════════ RESET & BASE ═══════════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--text);
  background: var(--bg-deep);
  display: flex;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
}

#app {
  width: 100%;
  max-width: 430px;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  position: relative;
  overflow-x: hidden;
  box-shadow: 0 0 80px rgba(226, 182, 79, 0.03);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

/* ═══════════════════ CANVAS (Particle Background) ═══════════════════ */
#particleCanvas {
  position: fixed;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  height: 100vh;
  height: 100dvh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
}

/* ═══════════════════ TOP BAR ═══════════════════ */
.top-bar {
  background: rgba(9, 9, 11, 0.88);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.top-bar h1 {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, var(--gold-light), var(--gold), var(--gold-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.top-bar .back-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; cursor: pointer;
  color: var(--text-secondary);
  border-radius: 50%;
  transition: var(--transition);
}
.top-bar .back-btn:hover { color: var(--gold); background: var(--bg-elevated); }
.top-bar .top-action {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; cursor: pointer;
  color: var(--text-secondary);
  border-radius: 50%;
  transition: var(--transition);
}

/* ═══════════════════ TAB BAR ═══════════════════ */
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 430px;
  background: rgba(9, 9, 11, 0.92);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  display: flex;
  border-top: 1px solid var(--border);
  z-index: 200;
  padding: 6px 0;
  padding-bottom: calc(6px + env(safe-area-inset-bottom, 0px));
}

.tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 4px 0;
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}
.tab-item.active { color: var(--gold); }
.tab-item .tab-icon { font-size: 1.25rem; line-height: 1; }
.tab-item .tab-badge {
  position: absolute;
  top: 0; right: calc(50% - 24px);
  min-width: 16px; height: 16px;
  background: var(--danger);
  color: #fff;
  font-size: 0.5625rem;
  font-weight: 700;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  padding: 0 4px;
}

/* ═══════════════════ PAGES ═══════════════════ */
.pages-container {
  position: relative;
  z-index: 1;
  padding-bottom: 70px;
  min-height: calc(100vh - 52px);
  min-height: calc(100dvh - 52px);
}
.page {
  display: none;
  padding: 16px;
  animation: pageIn 0.3s ease;
}
.page.active { display: block; }

@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in {
  animation: fadeUp 0.4s ease forwards;
}

/* ═══════════════════ HERO SECTION ═══════════════════ */
.hero-section {
  text-align: center;
  padding: 28px 0 8px;
  position: relative;
}

.hero-greeting {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.hero-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.3;
  margin-bottom: 4px;
  background: linear-gradient(135deg, #fff 20%, var(--gold-light) 50%, var(--gold) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* ═══════════════════ STREAK BAR ═══════════════════ */
.streak-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  background: linear-gradient(135deg, rgba(226, 182, 79, 0.08), rgba(226, 182, 79, 0.02));
  border: 1px solid var(--border-gold);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 16px 0;
}

.streak-bar .streak-icon {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold-dark), var(--gold));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.streak-bar .streak-info { flex: 1; }
.streak-bar .streak-count {
  font-size: 1.25rem; font-weight: 700;
  color: var(--gold);
}
.streak-bar .streak-label {
  font-size: 0.75rem; color: var(--text-tertiary);
  margin-top: 2px;
}
.streak-bar .streak-xp {
  font-size: 0.75rem; color: var(--text-tertiary);
}

/* ═══════════════════ STATS RING ═══════════════════ */
.stats-rings {
  display: flex;
  justify-content: space-around;
  gap: 8px;
  margin: 16px 0;
}

.stat-ring-item {
  text-align: center;
}

.stat-ring-item canvas {
  width: 68px; height: 68px;
}

.stat-ring-item .ring-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-top: -44px;
  position: relative;
  z-index: 1;
}

.stat-ring-item .ring-label {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

/* ═══════════════════ QUICK ACTIONS ═══════════════════ */
.quick-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 16px 0;
}

.quick-action {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.quick-action:hover {
  border-color: var(--border-gold);
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

.quick-action:active { transform: scale(0.98); }

.quick-action .qa-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.quick-action .qa-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.quick-action .qa-subtitle {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
}

.quick-action .qa-badge {
  position: absolute;
  top: 12px; right: 12px;
  background: var(--danger);
  color: #fff;
  font-size: 0.625rem; font-weight: 700;
  min-width: 20px; height: 20px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  padding: 0 6px;
}

/* ═══════════════════ CARDS ═══════════════════ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 12px;
  transition: var(--transition);
}

.card-gold {
  border-color: var(--border-gold);
  background: linear-gradient(135deg, rgba(226, 182, 79, 0.06), rgba(226, 182, 79, 0.01));
}

.card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.card-subtitle {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 20px 0 12px;
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.section-link {
  font-size: 0.75rem;
  color: var(--gold);
  cursor: pointer;
  text-decoration: none;
  font-weight: 500;
}

/* ═══════════════════ COURSE CARDS ═══════════════════ */
.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 10px;
  display: flex;
  gap: 14px;
  align-items: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.course-card:hover {
  border-color: var(--border-gold);
  background: var(--bg-card-hover);
}

.course-card:active { transform: scale(0.985); }

.course-card .cc-thumb {
  width: 56px; height: 56px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(226, 182, 79, 0.2), rgba(226, 182, 79, 0.04));
  border: 1px solid rgba(226, 182, 79, 0.25);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.course-card .cc-info { flex: 1; min-width: 0; }
.course-card .cc-title {
  font-size: 0.9375rem; font-weight: 600;
  color: var(--text); margin-bottom: 4px;
}
.course-card .cc-meta {
  font-size: 0.75rem; color: var(--text-tertiary);
  display: flex; gap: 8px; align-items: center;
}
.course-card .cc-arrow {
  color: var(--text-dim); font-size: 1.25rem;
}

.course-card .cc-progress {
  position: absolute;
  bottom: 0; left: 0; height: 3px;
  background: linear-gradient(90deg, var(--gold-dark), var(--gold));
  border-radius: 0 2px 0 0;
  transition: width 0.5s ease;
}

/* Lesson tree */
.unit-group {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 8px;
  overflow: hidden;
}

.unit-header {
  padding: 14px 18px;
  display: flex; justify-content: space-between; align-items: center;
  cursor: pointer;
  background: var(--bg-elevated);
  transition: var(--transition);
}
.unit-header:hover { background: var(--bg-card); }
.unit-header .uh-title { font-weight: 600; font-size: 0.875rem; color: var(--text); }
.unit-header .uh-count { font-size: 0.6875rem; color: var(--text-tertiary); }
.unit-header .uh-arrow { color: var(--text-dim); transition: transform 0.3s; }
.unit-header.open .uh-arrow { transform: rotate(180deg); }

.lesson-list { display: none; }
.lesson-list.open { display: block; }
.lesson-item {
  padding: 12px 18px 12px 36px;
  display: flex; align-items: center; gap: 10px;
  border-top: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-secondary);
}
.lesson-item:hover { background: rgba(226, 182, 79, 0.04); color: var(--text); }
.lesson-item.completed { color: var(--success); }
.lesson-item .li-check {
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.625rem;
  flex-shrink: 0;
}
.lesson-item.completed .li-check {
  border-color: var(--success);
  background: var(--success);
  color: #fff;
}
.lesson-item .li-title { flex: 1; font-size: 0.875rem; }
.lesson-item .li-dur { font-size: 0.6875rem; color: var(--text-dim); }

/* ═══════════════════ BUTTONS ═══════════════════ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 12px 20px; border: none; border-radius: var(--radius);
  font-size: 0.875rem; font-weight: 600; cursor: pointer;
  transition: var(--transition); text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gold-dark), var(--gold));
  color: #0a0a0a;
  width: 100%;
  box-shadow: 0 2px 8px rgba(226, 182, 79, 0.15);
}
.btn-primary:hover { box-shadow: 0 4px 16px rgba(226, 182, 79, 0.25); }
.btn-primary:active { transform: scale(0.98); opacity: 0.9; }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-outline {
  background: transparent;
  color: var(--gold);
  border: 1px solid rgba(226, 182, 79, 0.4);
}
.btn-outline:hover { background: rgba(226, 182, 79, 0.08); }
.btn-outline:active { background: rgba(226, 182, 79, 0.12); }

.btn-sm { padding: 8px 14px; font-size: 0.75rem; border-radius: var(--radius-sm); }
.btn-icon { width: 40px; height: 40px; padding: 0; border-radius: 50%; }

.btn-record {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--border);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
  position: relative;
}
.btn-record:hover { border-color: var(--gold); }
.btn-record.recording {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
  animation: pulse-record 1.5s ease-in-out infinite;
}
.btn-record .record-inner {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--danger);
  transition: var(--transition);
}
.btn-record.recording .record-inner {
  border-radius: 6px;
  width: 18px; height: 18px;
}
@keyframes pulse-record {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
  50% { box-shadow: 0 0 0 12px rgba(239, 68, 68, 0); }
}

/* ═══════════════════ AUDIO WAVEFORM ═══════════════════ */
.waveform {
  width: 100%;
  height: 64px;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow: hidden;
  margin: 12px 0;
}

/* ═══════════════════ VOICE FEEDBACK ═══════════════════ */
.voice-score {
  text-align: center;
  padding: 16px;
}

.voice-score .score-circle {
  width: 88px; height: 88px;
  border-radius: 50%;
  border: 3px solid var(--gold);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 12px;
  font-size: 1.75rem; font-weight: 700;
  color: var(--gold);
  background: rgba(226, 182, 79, 0.08);
}

.voice-score .score-detail {
  display: flex; gap: 12px; justify-content: center;
  margin-top: 8px;
}

.voice-score .score-item {
  text-align: center;
}

.voice-score .score-item .si-value {
  font-size: 0.875rem; font-weight: 600; color: var(--text);
}

.voice-score .score-item .si-label {
  font-size: 0.625rem; color: var(--text-tertiary);
}

/* ═══════════════════ FLASHCARD ═══════════════════ */
.flashcard-container {
  perspective: 800px;
  margin: 16px 0;
}

.flashcard {
  width: 100%; min-height: 220px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.5s ease;
}
.flashcard.flipped { transform: rotateY(180deg); }

.flashcard .fc-face {
  position: absolute;
  width: 100%; min-height: 220px;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 24px;
  text-align: center;
}

.flashcard .fc-front { z-index: 2; }
.flashcard .fc-back { transform: rotateY(180deg); }

.fc-korean {
  font-family: var(--font-korean);
  font-size: 2rem; font-weight: 700;
  color: var(--gold); margin-bottom: 8px;
}

.fc-rom {
  font-size: 0.875rem; color: var(--text-tertiary);
  margin-bottom: 12px;
}

.fc-chinese {
  font-size: 1.25rem; font-weight: 600;
  color: var(--text); margin-bottom: 8px;
}

.fc-pos {
  font-size: 0.75rem; color: var(--gold); opacity: 0.7;
  background: rgba(226, 182, 79, 0.1);
  padding: 2px 10px; border-radius: 10px;
  margin-bottom: 12px;
}

.fc-example {
  font-size: 0.8125rem; color: var(--text-secondary);
  font-style: italic; line-height: 1.5;
}

.flashcard-actions {
  display: flex; gap: 8px; justify-content: center;
  margin-top: 16px;
}

.fc-btn {
  padding: 10px 0; flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.75rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
  text-align: center;
}
.fc-btn:hover { border-color: var(--border-light); color: var(--text); }
.fc-btn.again { color: var(--danger); border-color: rgba(239, 68, 68, 0.3); }
.fc-btn.again:hover { background: rgba(239, 68, 68, 0.08); }
.fc-btn.hard { color: var(--warning); border-color: rgba(245, 158, 11, 0.3); }
.fc-btn.hard:hover { background: rgba(245, 158, 11, 0.08); }
.fc-btn.good { color: var(--info); border-color: rgba(59, 130, 246, 0.3); }
.fc-btn.good:hover { background: rgba(59, 130, 246, 0.08); }
.fc-btn.easy { color: var(--success); border-color: rgba(34, 197, 94, 0.3); }
.fc-btn.easy:hover { background: rgba(34, 197, 94, 0.08); }

/* ═══════════════════ PROGRESS BAR ═══════════════════ */
.progress-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin: 4px 0;
}

.progress-bar .progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold-dark), var(--gold));
  border-radius: 2px;
  transition: width 0.6s ease;
}

/* ═══════════════════ ACHIEVEMENT GRID ═══════════════════ */
.achievement-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.achievement-badge {
  text-align: center;
  padding: 12px 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.achievement-badge.unlocked {
  border-color: var(--border-gold);
}

.achievement-badge .ab-icon {
  font-size: 1.5rem; margin-bottom: 4px;
}

.achievement-badge .ab-title {
  font-size: 0.625rem; color: var(--text-tertiary);
  line-height: 1.3;
}

.achievement-badge.locked {
  opacity: 0.35;
  filter: grayscale(1);
}

/* ═══════════════════ GRAMMAR CARD ═══════════════════ */
.grammar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 16px;
  margin-bottom: 12px;
}

.grammar-card .gc-pattern {
  font-family: var(--font-korean);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 6px;
}

.grammar-card .gc-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.grammar-card .gc-explanation {
  font-size: 0.8125rem; color: var(--text-secondary);
  line-height: 1.6;
}

.grammar-card .gc-examples {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.grammar-card .gc-example-item {
  display: flex; gap: 12px; align-items: baseline;
  padding: 6px 0; font-size: 0.8125rem;
}

.grammar-card .gc-example-item .ge-ko {
  font-family: var(--font-korean);
  color: var(--text);
  flex: 1;
}

.grammar-card .gc-example-item .ge-zh {
  color: var(--text-tertiary); font-size: 0.75rem;
}

/* ═══════════════════ LESSON CONTENT ═══════════════════ */
.lesson-content {
  line-height: 1.8;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.lesson-content h1 { font-size: 1.25rem; color: var(--text); margin: 20px 0 10px; }
.lesson-content h2 { font-size: 1.0625rem; color: var(--gold); margin: 16px 0 8px; }
.lesson-content h3 { font-size: 0.9375rem; color: var(--text); margin: 12px 0 6px; }
.lesson-content p { margin-bottom: 10px; }
.lesson-content ul, .lesson-content ol { padding-left: 20px; margin-bottom: 10px; }
.lesson-content li { margin-bottom: 4px; }
.lesson-content code {
  background: var(--bg-elevated);
  padding: 1px 6px; border-radius: 4px;
  font-family: var(--font-korean);
  font-size: 0.875rem;
  color: var(--gold);
}
.lesson-content table {
  width: 100%; border-collapse: collapse;
  margin: 10px 0; font-size: 0.8125rem;
}
.lesson-content th, .lesson-content td {
  padding: 8px 10px; text-align: left;
  border-bottom: 1px solid var(--border);
}
.lesson-content th { color: var(--gold); font-weight: 600; }

/* ═══════════════════ QUIZ ═══════════════════ */
.quiz-container { margin: 16px 0; }

.quiz-progress {
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  margin-bottom: 20px;
}

.quiz-progress .qp-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold-dark), var(--gold));
  border-radius: 2px;
  transition: width 0.4s ease;
}

.quiz-question {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.6;
}

.quiz-option {
  padding: 15px 16px;
  margin-bottom: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: var(--transition);
  display: flex; align-items: center; gap: 10px;
}
.quiz-option:hover { border-color: var(--border-light); background: var(--bg-card-hover); }
.quiz-option:active { transform: scale(0.99); }
.quiz-option.selected { border-color: var(--gold); background: rgba(226, 182, 79, 0.08); }
.quiz-option.correct { border-color: var(--success); background: var(--success-bg); color: var(--success); }
.quiz-option.wrong { border-color: var(--danger); background: var(--danger-bg); color: var(--danger); }
.quiz-option .qo-letter {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--bg-elevated);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700;
  flex-shrink: 0;
}

.quiz-input {
  width: 100%; padding: 14px;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem; outline: none;
  margin-bottom: 12px;
  caret-color: var(--gold);
  font-family: var(--font-korean);
}
.quiz-input:focus { border-color: var(--gold); }
.quiz-input::placeholder { color: var(--text-dim); }

.quiz-match {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
  margin-bottom: 12px;
}

.quiz-match-item {
  padding: 12px; background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer; text-align: center;
  font-size: 0.8125rem; transition: var(--transition);
}
.quiz-match-item:hover { border-color: var(--border-light); }
.quiz-match-item.selected { border-color: var(--gold); background: rgba(226, 182, 79, 0.1); }
.quiz-match-item.matched { border-color: var(--success); background: var(--success-bg); }

/* ═══════════════════ QUIZ RESULT ═══════════════════ */
.result-header {
  text-align: center;
  padding: 24px 0;
}

.result-score-ring {
  width: 120px; height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold-dark), var(--gold));
  margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
  color: #0a0a0a;
  font-size: 2.25rem; font-weight: 700;
  box-shadow: 0 0 40px rgba(226, 182, 79, 0.2);
}

.result-msg {
  font-size: 1.0625rem; font-weight: 600;
  color: var(--text); margin-bottom: 4px;
}

.result-stats {
  font-size: 0.8125rem; color: var(--text-secondary);
}

.result-detail {
  margin-top: 16px;
}

.result-detail .rd-item {
  padding: 12px; background: var(--bg-card);
  border-radius: var(--radius-sm); margin-bottom: 8px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--danger);
}

.result-detail .rd-item.correct {
  border-left-color: var(--success);
}

.rd-question {
  font-weight: 600; margin-bottom: 6px;
  color: var(--text); font-size: 0.875rem;
}

.rd-answer {
  font-size: 0.8125rem; color: var(--text-tertiary);
  margin-bottom: 2px;
}

.rd-correct {
  font-size: 0.8125rem; color: var(--success);
}

/* ═══════════════════ FILTER PILLS ═══════════════════ */
.filter-pills {
  display: flex; gap: 6px; margin-bottom: 16px;
  overflow-x: auto; padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
}
.filter-pills::-webkit-scrollbar { display: none; }

.filter-pill {
  padding: 6px 14px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-tertiary);
  font-size: 0.75rem; font-weight: 500;
  cursor: pointer; white-space: nowrap;
  transition: var(--transition);
}
.filter-pill.active {
  background: rgba(226, 182, 79, 0.12);
  border-color: var(--border-gold);
  color: var(--gold);
}
.filter-pill:hover:not(.active) { border-color: var(--border-light); }

/* ═══════════════════ SKELETON LOADING ═══════════════════ */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-elevated) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-line { height: 16px; margin-bottom: 8px; }
.skeleton-line.short { width: 60%; }
.skeleton-card { height: 80px; margin-bottom: 10px; }
.skeleton-circle { width: 68px; height: 68px; border-radius: 50%; }

/* ═══════════════════ TOAST ═══════════════════ */
.toast {
  position: fixed; top: 70px; left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--bg-card);
  color: var(--gold);
  border: 1px solid var(--border-gold);
  padding: 10px 20px; border-radius: 20px;
  font-size: 0.8125rem; font-weight: 500;
  z-index: 400;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  white-space: nowrap;
  box-shadow: var(--shadow);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ═══════════════════ EMPTY STATE ═══════════════════ */
.empty-state {
  text-align: center; padding: 48px 20px;
  color: var(--text-dim);
}

.empty-state .empty-icon {
  font-size: 3rem; margin-bottom: 12px;
  opacity: 0.5;
}

.empty-state .empty-text {
  font-size: 0.875rem; margin-bottom: 8px;
}

/* ═══════════════════ TTS BUTTON ═══════════════════ */
.tts-btn {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px;
  background: rgba(226, 182, 79, 0.08);
  border: 1px solid rgba(226, 182, 79, 0.2);
  border-radius: 12px;
  color: var(--gold); font-size: 0.75rem;
  cursor: pointer; transition: var(--transition);
}
.tts-btn:hover { background: rgba(226, 182, 79, 0.15); }
.tts-btn:active { transform: scale(0.95); }

/* ═══════════════════ UTILITY ═══════════════════ */
.text-gold { color: var(--gold); }
.text-sm { font-size: 0.8125rem; }
.text-xs { font-size: 0.6875rem; }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.flex-1 { flex: 1; }

/* ═══════════════════ RESPONSIVE ═══════════════════ */
@media (min-width: 768px) {
  .achievement-grid { grid-template-columns: repeat(5, 1fr); }
}

/* ═══════════════════ SCROLLBAR ═══════════════════ */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }